You are correct most tires need higher pressure for Autocross so the sidewalls don't roll over. I ran the Dunlop Z2 and they liked a bit more pressure, 38F and 36R. Lighter cars like Miatas always seem to like more pressure than heavy cars like ours. The pressures I use on the 615K are cold pressures, again with the 615 K you don't get huge pressure increases as the tire doesn't get overheated by falling over on itself. It's a very stable, planted tire in the corners and the pressure after most Autocross runs in my Valiant is rarely up more than 1 or 2 psi. Any more pressure increase than that and you're over driving...